qed: Convert to bdrv_co_pwrite_zeroes()
Another step on our continuing quest to switch to byte-based interfaces. Kill an abuse of the comma operator while at it (fortunately, the semantics were still right). Also, the test for requests not aligned to clusters should be applied always, not just when a backing file is present. Signed-off-by: NEric Blake <eblake@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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